Doup heddle carrying rod for leno and cross weaving



Nov. 21, 1967' B. R. KOCH I 3,353,569

DOUF HEDDLE CARRYING ROD FOR LENO AND CROSS WEAVING Filed Oct. 14, 1965 United States Patent 3,353,569 DOUP HEDDLE CARRYING ROD FOR LENO AND CROSS WEAVING Bernhard R. Koch, Horgenberg, Switzerland, assignor to Grob & Co. AG., Hon-gen, Switzerland Filed Oct. 14, 1965, Ser. No. 495,790 Claims priority, application Switzerland, July 7, 1965, 10,406/ 65 8 Claims. (Cl. 13951) ABSTRACT OF THE DISCLOSURE The present invention relates to improvements in loom harness for leno and cross Weaving, and more particularly to a doup heddle carrying rod having a rib-like projection to limit movement of the doup heddle in the direction of the lifting heddle.

The heddles normal today for the production of leno weaves each consist of two lifting heddles and one doup heddle. The leno weaving frame consists of two lifting frames for the lifting heddles and one heddle frame for the doup heddles. The lifting heddles are strung on the heddle carrying rods of normal heddle frames called lifting frames and the doup heddles on the two heddle carrying rods forming what is called herein the heddle frame. These heddle carrying rods of the heddle frame are made from a fiat band and correspond to the heddle carrying rods in general use.

The two heddle carrying rods per heddle frame run, at approximately the same height, parallel to the heddle carrying rods over the whole useful length of the lifting frame and are simply connected to one another, at their ends, preferably keeping them a given distance apart. The resulting frame forms the heddle frame and surrounds the two rows of lifting heddles which control it laterally. If one of the lifting frames is raised,-then the heddle frame together with the doup heddles consequently slides upwardly on the lifting heddles carried on the opposite lifting heddle frame. Due to the alternate raising of one or other of the lifting frames, the heddle frame is continually sliding on the lower portion of the lifting hed dles. Obtaining unhindered sliding of the heddle frame is rendered difficult by the following circumstances.

The doup heddles are each strung onto the heddle carrying rods of the heddle frame by their end loops. When, as just described, the heddle carrying rods of the heddle frame slide on the lifting heddles the parts of the doup heddle ends lying between the heddle carrying rods and the lifting heddles have to push between the lifting heddles. But the shank ends of the doup heddle also slide on the edges of the lifting heddles until they slip between the shanks of the lifting heddles due to contact pressure. It so happens in practice that the forces causing the sliding alternate continuously. The sliding is further rendered difficult in that the ends of the doup heddle do not always push between the shanks of the related lifting heddle shanks, but between those of adjacent heddles. In this Way the friction on sliding up and down is greatly increased by mutual sticking.

During weaving the heddle frame is necessarily raised and it should slide back under its own weight, the hindrances to sliding mentioned above make it necessary for the heddle frame to be pulled down by means of drawsprings and the result of this is increased wear.

The ends of the doup heddle scratch on the edges of the lifting heddles until the protective galvanised layer on them partially comes off. As a result the heddles are attacked by rust, the doup heddles slide still more badly 3,353,569 Patented Nov. 21, 1967 and the standard ends are damaged by the loosening parts of the galvanised coating or are even torn. If, as described, the ends of the doup heddles do not slip between the related lifting heddles but between heddles adjacent to the related ones, then the standard ends and possibly the warp ends of the ground warp as well block the way into the lower shed. If the overlapping shanks of the doup heddles cannot be forced by obstructed warp ends into the correct position then an unclean shed results and the Warp ends are over-tensioned or even broken. The upright position of the heddles in the harness is very unsettled which also leads to increased rubbing of the warp ends on the leno heddles. The power necessary to move the frames is continually increased due to the increased points of friction and the rough running. Consequently all the weaving heddles and the drive members are of necessity subjected to greater stress until further Wear points appear therein.

These circumstances prevent the achievement of increased numbers of picks on the loom, which is damaging to economical production of leno weave.

It is an object of the present invention to eliminate the disadvantages stated. In the construction according to the invention the end loops on the shank ends of the doup heddles are open as is known per se in various embodiments of normal heddles. In addition the heddle carrying rod is so profiled, i.e. has a cross-section of such a shape that a part thereof passes out through the apertures of the end loops and projects beyond the shank of the doup heddle, so that it abuts against and rests on the lifting heddles. As a result, there is no longer any possibility for the ends of the doup heddles to come into contact with the lifting heddles and push themselves therebetween.

These novel shaped doup heddle carrying rods slide without hindrance on the lower portions of the lifting heddles.

Further objects and advantages of the invention will be apparent from the following description of embodiments thereof given by way of example only and with reference to the attached schematic drawings in which:

FIG. 1 shows a cross section of a loom harness;

FIG. 2 shows a portion of FIG. 1 on an enlarged scale;

FIG. 3 shows the doup heddle carrying rod of the heddle frame in perspective;

FIGS. 4 and 5 show further embodiments of the doup heddle carrying rod of the heddle frame.

In FIG. 1 the numbers 1, 2, 3 and 4 denote the staves of the top and bottom rails of the heddle frames of a loom harness for cross weaving. The numbers 5, 6, 7 and 8 denote the heddle carrying rods for the lifting heddles. The two lifting heddles shown are denoted by 9 and 10 and the doup heddles by 11. The doup heddle 11 is strung on two carrying rods 12 and 13 which are connected together at their ends by means of so-called stoppers 23.

In FIG. 2, 9 denotes a section of one lifting heddle of the lifting heddles and 11 the doup'heddle. The doup heddle carrying rods 12 and 13 of the loom harness are formed T-shaped in cross-sections and for-med with rectangular shaped web portions having a rib 16 which projects out through an aperture 15 in the end loop 14 of the doup heddle 11 and lies against the lifting heddle 9. As already explained, in the construction shown, it is no longer possible for the doup heddle 11 to come into contact with the lifting heddle 9 in the area of the do'up heddle carrying rod 12 of the loom harness.

In FIG. 3 the rib 16 is recessed as at 17. By this the Weight of the doup heddle carrying rod 12 can be decreased; in addition, any possible deposit of dirt on the upper edge 18 of the rib 15 is decreased.

FIG. 4 shows an embodiment of the doup heddle carrying rod for the doup heddles in which the slide surface 19 which lies against the lifting heddles in the working position is increased in vertical direction.

FIG. 5 shows a profile of another embodiment of the doup heddle carrying rod in which the rod is composed of a metal covering and a profiled core 21 of H-shape, preferably made of plastic, for example nylon. If desired, the entire doup carrying rod may be produced from a suitable plastic.

In operation, it is to be pointed out that a cross weave or leno heddle is composed of two lifting heddles and a doup heddle. The lifting heddles are threaded onto the heddle rod of the lifting frame and the end loops at the lower ends of the doup heddle shanks are also mounted on heddle rods which are connected together at their ends thus forming a doup heddle frame. The lifting heddles operate to guide the doup heddles during movement and each lifting heddle is made of two separate flat steel strips spot welded at their center. The shanks of the heddle run between the two steel strips of the lifting heddle and are thus guided. The doup heddle rests on the spot weld of the lifting heddle and is pulled upwardly by the rising lifting heddle whereby one of its shanks runs between the two flat steel strips of the other lifting heddle remaining in the lower shed. The heddle itself lifts up the two heddle rods of the doup heddle frame and thus the lifting thereof is positive. When at the shed change a lifting heddle is lowered, the heddle and the heddle frame must also follow the same movement.

To enable the heddle frame to follow the movement of the lifting frame yokes are hung onto the double heddle carrying rods 12 and 13 at intervals spaced approximately 20 inches apart. A spring is attached to each yoke which is tensioned such that the power of traction insures a faultless lowering of the heddle frame. Such yokes usually embody a bracket member extending between the doup heddle carrying rods which is connected to a yoke having a spring aflfixed to the bottom thereof which is attached to the loom. Thus, the pull exerted on the heddle frame raises the doup heddles while the spring force exerted downwardly on the doup heddle rods causes the doup heddles to follow the downward movement of the lifting heddles.

What I claim is:

I. A loom harness for cross weaving having adjacent pairs of lifting heddles carrying a doup heddle loom harness comprising two parallel doup heddle carrying rods, each of said rods having a rib along at least part of its length projecting towards the other rod, each doup heddle having an end loop at each end carried on one of said rods and said end loops being formed with apertures which receive said ribs and allow such to project through the apertures of the end loops and rest on the adjacent lifting heddles.

2. In a loom harness for cross weaving (l) lifting heddles and adjacent lifting frames carrying said lifting heddles,

(2) doup heddles carried by said lifting heddles,

(3) two carrying rods connected at their ends and extending parallel to one another and also parallel to said adjacent lifting frames, each of said rods being formed with (4) a web portion and (5) a rib part extending along at least part of said web portion and projecting towards the other of said carrying rods,

(6) said doup heddles having end loops carried on said rods and formed with apertures receiving said ribs which project through the peripheries of the end loops and rest in sliding relationship on the lifting handles.

3. A loom harness for cross weaving according to claim 2, wherein each doup heddle carrying rod is of T-shaped cross-section formed with a rectangular shaped web portion having a horizontal rib thereon.

4. A loom harness for cross weaving according to claim 3, wherein the rib is formed with cut-away portions spaced apart along the web.

5. A loom harness for cross weaving according to claim 2, wherein the doup heddle carrying rods are H-shaped in cross-section.

6. A loom harness for cross weaving according to claim 2, wherein each doup heddle carrying rod is at least partly composed of a synthetic plastic material such as nylon.

7. A loom harness for cross weaving according to claim 2, wherein each doup heddle carrying rod comprises a synthetic plastic core having a metal covering on the web portion carrying the end loops of the doup heddles.

8. A loom harness for cross weaving having adjacent lifting heddles, said harness comprising a pair of parallel doup heddle carrying rods, doup heddles supported by said lifting heddles, end loops on said doup heddles for receiving said carrying rods, each of said rods being provided with a longitudinally projecting rib extending in the direction of the other rod and the rib of each rod projecting through an aperture formed in a corresponding end loop of the said doup heddle for engaging the outer surfaces of the adjacent lifting heddles to limit movement of said end loops in the direction of said lifting heddles.

References Cited HENRY S. JAUDON,

MERVIN STEIN, Examiner.

Primary Examiner. 

1. A LOOM HARNESS FOR CROSS WEAVING HAVING ADJACENT PAIRS OF LIFTING HEDDLES CARRYING A DOUP HEDDLE LOOM HARNESS COMPRISING TWO PARALLEL DOUP HEDDLE CARRYING RODS, EACH OF SAID RODS HAVING A RIB ALONG AT LEAST PART OF ITS LENGTH PROJECTING TOWARDS THE OTHER ROD, EACH DOUP HEDDLE HAVING AN END LOOP AT EACH END CARRIED ON ONE OF SAID RODS AND SAID END LOOPS BEING FORMED WITH APERTURES WHICH RECEIVE SAID RIBS AND ALLOW SUCH TO PROJECT THROUGH THE APERTURES OF THE END LOOPS AND REST ON THE ADJACENT LIFTING HEDDLES. 